Hoist



11 7' H. s. KITCHEVLL HOIST Filed April 24 1923 2 Sheets-Sheet 1 Jan. 11', 1927. H. G. Kl I CHELL HOIST Filed April 24 1923 2 Sheets-Sheet 2 IIIIE.

Patented Jan. 11,1927.

UNITED STATES PATENT OFFICE.

HORACE G. KITCHELL, OF GREENWOOD, MISSISSIPPI.

HOIST.

Application filed April 24, 1923. Serial No. 634,335.

This invention relates to hoists and it has i for its objects, among others to provide. a

The device is compact, the parts are so arranged as to be practically fool-proof, read1- ly assembled and easily accessible in case of repairs or replacement.

My present improvement is shown in connection with a hoist but is adapted for use in connection with shafts of different kinds and sizes and is adapted for special eiiicient operation in a variety of uses, for reducing or increasing the speed of shafting and obviating the employment of belting and other devices of this character. The operation and advantages of my present improvement embodying means for reduction or multiplication of speeds will be readily understood by those skilled in the art to which it appertains by reason of its positive action and adaptability where certain speeds are desired in one member and another speed in another member, without disturbing the alignment of either shaft coa-Xially, each being in the same plane vertically and horizontally.

()thcr objects and advantages of the invention will l'iereinafter appear and the novel features thereof will be particularly pointed out in the appended claims.

The invention is capable of embodiment in a variety of forms some only of which are herein illustrated as showing eflicient embodiments of the invention.

The invention, in such preferred forms, is clearly illustrated in the accompanying drawings, which with the'numerals of reference marked thereon form a part of this specification and in'which Figure 1 is a side elevation of my improved hoist;

Fig. 2 is an edge view thereof;

Fig. 3 is an elevation of the side opposite that seen in Figure 1;

Fig. 4 is a vertical section on the line 4% of Figure 2, looking in the direction of the arrows;

Fig. 5 isa detail in face view with parts removed;

Fig. 6 is a face view of the disc and its accessories which have been removed from the device to disclose the parts seen in Figure 5;

Fig. 7 is a section as on the line 7-7 of Figure 5, looking'in the direction of the arrows;

Fig. 8 is an edge view of the parts shown in Fig.6;

Fig. 9 is a view similar to Fig. 6 showing a modified form.

Like numerals of reference indicate like parts in the several views.

In carrying out my invention, in the various forms in which it may be embodied, the same generic principle is adhered to and the following description of the construction herein illustrated is given with that understanding. Referring to the drawings, 1 is a casing chambered asat 2 to receive the operative parts, the annular flanged portion 3 thereof being provided with holes 4 for a purpose which will soon be made clear. This chamher 2 is provided with a circular recess 5 and a smaller recess 6 in communication therewith and disposed eccentrically with relation thereto as seen clearly in Figures 5 and 7. 7 is a projection from the face of the casing as seenin Figures 2 and 7 in which is seated a hub 8 ofa sprocket wheel 9, the said hub having an axial bore 10 which is coaxial with the center of the casing l and receives the reduced end portion 11 of the shaft 12, which is mounted in the axial bore 13 of the projection or hub 7, all as clearly illustrated in Figure 7. Adjacent the 511011]:- der 14 on the shaft 12 the reduced portion is provided with lateral pins or the like which engage in notches 16 so as to so connect the hub 8 of the sprocket wheel with the shaft 12 as to cause the two to revolve in unison. Suitable ball bearings 17 are shown between the top of the sprocket and the adjacent wall of the bore of the member 7.

18 is a threzuled member having its inner end tapered as at 19 to form a conical bearing for the balls 20 interposed between the same and an annular groove or raceway in the hub 8 of the sprocket. 6n this threaded member is a nut 21 which is adapted to be screwed up against the end of the bar or arm 22 into which the said threaded member is screwed, as seen clearly in Figure 7, thus holding the parts fixedly in position and providing for adjustment when necessary.

23 is an upright projecting from a ring 24 sleeved on the hub or portion 7 of the casing 1, as seen in Figures 1 and 2, the said member 23 at its upper end having the lateral portion or member 25 in which is swivelled the hook 26in any well known way, see Figures 1, 2, 3 and 4.

The arm 22 is offset as at 27, see Figure 2, and its upper end is braced from and fixed rigidly in position with relation to the member 23 by the bolt 28 having one end held in the upper end of the member 22 and its other end in the member 23 and preferably surrounded by a sleeve 29. Below the offset 27 there extends through the member 22 a bolt 30, the inner end of which is threaded into the casing 1 as indicated by dotted lines in Figure 2, and around this bolt is a sleeve 31, while the outer end of the bolt receives a nut 32, permitting of adjustment when necessary and of removal of the parts when desired.

The shaft 12 carries a gear 33 which is disposed in the recess 6 of the casing 1, which gear in turn meshes with the smaller gear 3-4 mounted on the shaft 35 carried by the disc 36. This disc 36 constitutes a tram.- mel member or element pivotally mounted on which, as at 37, are the blocks 38 which are designed to travel in the radial channels 39 in the disc or trammel member 40. These channels 39 are preferably undercut, as shown in Figures 6 and 8, as is usual in this class of devices.

By reason of the blocks 38 being pivotally mounted on the disc 36 they act as levers against the gear 34. and as one block is being actuated by the disc 40 at its periphery, its mate, that is the other block, is passing the center of the disc 40 without resistance, and by reason of the lever action and the greater rapidity of motion of the block at the center I obtain a differential motion, not a planetary motion, as the pin 35 will prevent any planetary motion. although the benefits derived are substantially the same as derived from a planetary motion and the two members 12 and 40 are kept in perfect alignment without which such differential motion could not be obtained.

The outer face of the member 40 is provided with a projection 41 having a pin 42 adapted to engage in a hole 43 in the adjacent face of the hand chain wheel 44, as will be readily understood upon reference to F gure 45 is a ring secured by screws or the like 46 engaging the holes 4 in the member 1 and overlapping the peripheral edge of the member 40 to retain the latter and the parts carried thereby in position and holding them against displacement.

The wheel 44 is sleeved upon the projection 47 of the member 41 and is secured in position by a disc 48 through which passes a bolt- 49 engaging threads insaid member 47 This permits of tightening of the wheel 44 when desired.

As hereinbefore stated, the principle of my invention is capable of embodiment in a number of forms, and in Figure 9 I have shown one of such forms by way of example, the variation being mainly as to the drive. For instance, in this form I have shown in lieu of the two intermeshing gears 33 and 34 of the form seen in Figure 5, a sprocket wheel 50 on the shaft 12 and a sprocket wheel 51 on the shaft 35 and connect these two sprockets by a sprocket chain 52 whereby revolution of the disc 36 imparts rotary motion to the shaft 12, it being understood that theremainder of the device is the same as hereinbefore described in connection with the other figures, except that the shafts 12 and 35 revolve in the same direction instead of in reverse directions as in Figure 5.

-he operation is as follows:

Said device being suspended as hoists usually are, power is applied through a pull chain (not shown) on the chain wheel 44 (or by such means as found necessary in special applications of the device), which in turn is the means of rotating rotatable element 40, which has on its reverse side, away from the chain wheel 44, the channels or grooves crossing each other at right angles, suitably arranged for the reception of the blocks 38, which travel through said channels 39 which have under-cut steps, whereby said blocks 38 cannot be removed or disarrangcd unless pivotal pins 37 are first removed from the rotatable disc 36,

which is the second and smaller disc, and it, together with the two blocks 38 set in position and pivotally fastened to rotatable element 40 forms a trammel of unusual application, which rotates the rotatable disc 36 3 twice to every one turn of rotatable disc or element 40 the operation of which motion is to produce a difierential movement resulting in a gain in leverage, by reason of the Swift travel of one block 38 past the center,

while the other block 38 its mate is being actuated by force applied to the rotary element 40, as the aforesaid block is not opposed while passing the center of thedisc 40 and is free to move without resistance until it has traveled twice as far, where it takes its position, first as helper, then individually carries the load as its mate had done. This motion being continuous during the action forward or backward, of the trammel, where the varying speeds of the blocks 38 rotating disc 36 produce a gain in leverage or differential, which, when in action, is brought to light by its double speed thus produced.

On the reverse side of the rotatable disc 36 will be seen a cog wheel or gear 3st, which I is fixed to the disc 36 and which turns with the disc 36 and meshes in its mate 33, fixed on the shaft 12, see Figure 9, which con--;

stitutes one means of connecting traminel as sembly to the driven shaft 12, and another means is shown in Figure '9 where two sprockets 50 and 51 are used to drive the shaft 12 by use of the sprocket chain 52 connecting the trammel assembly with the driven shaft 12, see Figures 5 and 7. The effect of the use of the gears 34 and 36 is to give the shaft 12 a reverse motion, which is necessary in some uses, and variation of sizes of gears gives a reduced or a multiplied speed to theshaft 12, as desired, and the shaft 12 will travel in the opposite (direction, t0 the rotatable element 40 where power is applied first in a hoist, see Figi'ire t). The effect of the use of sprockets 50 and 51 connected to trammel assembly, from the shaft 12 by a sprocket chain 52 is to give the shaft 12 a motion in the same direction, which is necessary in some uses, and variation of sizes of sprockets gives a reduced or a multiplied speed of the shaft 12, as (tlesired,

and the shaft 12 will travel in the same direction as does the rotatable element. 40

where power is applied first in a hoist. I

However, it is evident that power may be applied to shaft 12 instead of the'rotatable element 40 either with gears or sprocket and chain, and such a use for the device, does not violate the scope of spirit of my invention should such a use he desired.

Again it is evident. that power may be applied to the rotatable element 40 in many ways, among which is through a shaft (not shown) extended from the face side where the chain pull wheel 44 is bolted in place and the chain pull wheel -44: may be set on the shaft, so extended, many feet away, or

even a pulley may be substituted-for said chain wheel, without departing from the consisting of the rotatable disc 36 with the gear 34 and its mate 36are recessed into the casing 1 at an angle to the line of lift,

the purpose of which is to locate the power application in the trammel assembly in the position of best effect and at right angles to the line of pull, also the line of lift, and the discharge of effort-or power applied to the rotatable element 40 at this point, eccentri-V cally located in relation thereto, is an advantage in its application to hoists.

When a person uses an implement say a crow-bar the force of his eifort'is applied to the object atright angles, for otherwise he would either push or pull it. Mechanically the location of the pin 35 in the hoist as shown in thedrawings is quitebimportant,

as the application of force to the member 40 at the periphery, and transmitted to the disc 36, by means of the trammel blocks bring in features of arrangement best suited to the purpose, hence the pivot'35 islocated where most advantage, is obtained, that is relative" ly to the line of force applied to the driving member 50.

Inmy Patent No. 1,527,311, dated February 24, 1925 I have'shown and 'claimed a mechanical movement. similar to that here in shown and-described, but not disclosing any application of thesame to a hoist.

Modifications in detail, proportion of parts, etc., may be resorted to without departing'from the spirit of the invention or sacrificing any of itsadvantages.

lVhat is claimed as new is I In a hoist, a suspending member, a shaft supported therein, means .supported by said suspending means for rotating said shaft, abearing for said shaft, means connecting said hearing with said suspending member, and a sprocket wheel carried by; said shaft and having its hub disposed in a recess in said bearingand receiving said shaft.

In testimony whereof I aflix my signature.

nonaon e. KIToHnLL. 

